[SOLVED] How to point to Java

I want to install google refine .. and I get an error message: are you sure your JAVA_HOME environment variable is pointing to a proper java installation?
Ubuntu 13.04

meow@meow:~/Downloads$ tar xzf google-refine-2.5-r2407.tar.gz
meow@meow:~/Downloads$ cd google-refine-2.5/
meow@meow:~/Downloads/google-refine-2.5$ ./refine
./refine: 98: [: /tmp/refine.EqxIsYp: unexpected operator
Could not find the 'java' executable at '', are you sure your JAVA_HOME environment variable is pointing to a proper java installation?
meow@meow:~/Downloads/google-refine-2.5$ java -version
The program 'java' can be found in the following packages:
* default-jre
* gcj-4.6-jre-headless
* gcj-4.7-jre-headless
* openjdk-7-jre-headless
* openjdk-6-jre-headless
Try: sudo apt-get install <selected package>
meow@meow:~/Downloads/google-refine-2.5$